Question

The principal advantage of sending electric power across country on very high voltage transmission lines is that

Answer 1

The principal advantage of sending electric power across country on very high voltage transmission lines is that it minimizes the power loss due to resistance in conductors.

Step-by-step explanation:

To answer this question, we must keep in mind the relationship between power, current and resistance, that can be written as:

`P=I^2R`

So power is dissipated as heat. From the equation, the power loss in the transmission line is proportional to
`I^2`. Another relationship we need to talk about is between power, current and voltage:

`P=VI`

As you can see, current is inversely proportional to voltage, so if you increase the voltage, then the current decrease and the power loss also decreases.